ta31273fn TOSHIBA Semiconductor CORPORATION, ta31273fn Datasheet - Page 5

• Manufacturer Part Number: ta31273fn
• Description: Am Rf/if Detector Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

6. Battery-saving (BS) function and Lo switch LOBS function
7. RF amp gain 1
8. IF amp gain
9. Waveform-shaping output duty cycle
10. Local frequency range (after multiplying frequency by 8)
The IC incorporates a battery-saving function and a Lo switch function. These functions offer the following
selection.
RF amp gain 1 (G
G
The intended value is 70dB.
The specified range of electrical characteristics is only available for single-tone.
When the multiplier circuit is used, the local frequency will be in the range 250.7 MHz to 439.3 MHz.
V
(RF) 1 is calculated as follows:
G
V (RF) 1
BS Pin/LOBS Pin
= G
V
H/H
H/L
L/H
L/L
RF
(RF) 1) is a reference value calculated as follows. Measure GRF in the following figure.
− G
16
4
V (MIX)
Circuits in operation
x8 circuit only halted, Frequency set by
external circuit can be used as-is.
x8 circuit only in operation
All circuits halted
• x8 circuit
• Mixer
• RF amp
• Comparator
• IF amp
• RSSI
• Comparator capacitor charger circuit
0.01 µF
G
14
6
RF
Figure 4
Circuit Status in the IC
5
11
1000 pF
6 pF
SAW
IC Current Dissipation
6.8 mA (typ.)
3.8 mA (typ.)
3.0 mA (typ.)
(at no signal)
0 mA (typ.)
SG
50dBµV
TA31273FN
2002-07-08